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- Miki Katoh, Masaki Fujimoto, +7 authors Yutaka Takashima
- Physical review letters
- 2017

We theoretically demonstrate for the first time that a single free electron in circular or spiral motion emits twisted photons carrying well-defined orbital angular momentum along the axis of the electron circulation, in adding to spin angular momentum. We show that, when the electron velocity is relativistic, the radiation field contains harmonic… (More)

- Yoshitaka Taira, Takehito Hayakawa, Masahiro Katoh
- Scientific reports
- 2017

Inverse Thomson scattering is a well-known radiation process that produces high-energy photons both in nature and in the laboratory. Nonlinear inverse Thomson scattering occurring inside an intense light field is a process which generates higher harmonic photons. In this paper, we theoretically show that the higher harmonic gamma-ray produced by nonlinear… (More)

- Yoshitaka Taira, Hiroyuki Toyokawa, +4 authors Miki Katoh
- The Review of scientific instruments
- 2013

High-energy ultrashort gamma-ray pulses can be generated via laser Compton scattering with 90° collisions at the UVSOR-II electron storage ring. As an applied study of ultrashort gamma-ray pulses, a new photon-induced positron annihilation lifetime spectroscopy approach has been developed. Ultrashort gamma-ray pulses with a maximum energy of 6.6 MeV and… (More)

- Sigeki Aoki, Koichi Kodama, +30 authors Ikuo Tezuka
- 2009

A new gamma ray observation project with the balloon borne emulsion chambers is presented. New technique based on the accelerator emulsion experiments was implemented for studying high energy stellar objects with cosmic gamma rays. This paper provides the concept of this project and the current status as well as some results of test experiments.

- Yoshitaka Taira, Shukui Zhang
- Optics letters
- 2017

Diffraction patterns of an optical vortex through several shaped apertures reveal its topological charge. In this Letter, we theoretically and experimentally show that diffraction of a Laguerre Gaussian beam through a circular aperture at an off-axis position can be used to determine the magnitude and sign of the topological charge. To our knowledge, this… (More)

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